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I would speak to Paul at RStuning about the 421 CatCams... he was looking for a car to fit / map these on (for a very good price as he hasn't mapped them before) :)
the 182 cat is already a good item (a lot better than some of these 'sports cats' you see on the market), just got for a decent cat back exhaust system.
Depending if the car has RS stamped inlets would determine what gains you would see from inlet matching.
Plenty of cam profiles available...
http://www.worldsaparts.co.uk/
http://www.renaultpartsdirect.co.uk/
http://www.worldofpartsltd.co.uk/catalog/index.php
Those guys should be able to help you out.